I just took the simplest demo from http://docs.angularjs.org/api/ng.filter:orderBy and just change the value of age to have different number of digit. It stop working as it
You just have to remove quotes in age variable because it's an integer, not a string:
$scope.friends =
[{name:'John', phone:'555-1212', age:2352345},
{name:'Mary', phone:'555-9876', age:4235243},
{name:'Mike', phone:'555-4321', age:241},
{name:'Adam', phone:'555-5678', age:34325},
{name:'Julie', phone:'555-8765', age:1234}]